We Recently covered a technology article on – VVT , VVTi And VVTLi In Plain English, continuing on one of the application of the same, this article will give some practical side of it.
Do you ever wonder how superb powerful cars like BMW gives such a wonderful power and performance without compromising the fuel efficiency ?
The answer is VANOS:
VANOS stands for “variable Nockenwellensteuerung”, which means automobile variable valve timing. The technology was invented by BMW and first introduced in 1992 & entered in production in 1997.
The Double-VANOS continuously adjust the intake & exhaust manifold, camshaft for better performance at Low & High speed. This leads to higher torque at low speed and higher fuel economy at high speed.
At lower engine speeds, the position of the camshaft is moved so the valves are opened later, as this improves idling quality and smooth power development.
As the engine speed increases, the valves are opened earlier: this enhances torque, reduces fuel consumption and lowers emissions.
At high engine speeds, the valves are opened later again, because this allows full power delivery.
Double-VANOS also controls the amount of exhaust gas that is re-circulated back to the intake manifold, enhancing fuel economy. The system uses a special set of parameters in the engine’s warming-up phase in order to help the catalytic converter reach its ideal operating temperature more quickly, lowering emissions. The entire process is controlled by the vehicle’s Digital Motor Electronics (DME).
